1929 General Election - Blackburn
| Year | 1929 |
| General election | 1929 General Election |
| Constituency | Blackburn |
| Turnout | 82.6% |
Results
| Candidate | Party | Votes |
| Hamilton, Mary Agnes | Labour | 37,256 |
| Gill, Thomas Harry | Labour | 35,723 |
| Henn, Sydney Herbert Holcroft | Unionist | 35,249 |
| Isaacs, Gerald Rufus | Liberal | 34,504 |